Go on a quest around Rotterdam by solving clues that will unlock stories, all on your smartphone.Each clue will lead you from one place to another, giving you exact directions, so you won’t need a map, a GPS or a guide. When you solve it and guess the answer, the secret story of that place is unlocked.After you buy the quest, you will receive an access code that you can use in the app.Along the way, you’ll find fascinating stories of secret agents who operated here and you will discover hidden secrets about the buildings you visit.It will take you from 1.5 to 2 hours to complete, but there’s no time limit, you can finish it at your own pace. The total length is about 3 km. You won’t need a guide, just download the app, go to the starting point and you’re ready to go on a city exploration adventure. As you solve the clues, you'll discover new locations and stories.